To delete an attendance status that you added, do the following:
Click on your name > Settings.
Click on the Calendar tab.
Scroll down to Lesson Settings section < Edit Attendance.
In the Edit Attendance box, scroll down until you find the status that you added. In this case the Student Late status.
Mouse over this status and click on the X to delete it.
You will see a popup box asking if you are sure. Click on the OK button.
The attendance status is now deleted. It no longer shows in the Edit Attendance list.